Nitrogen fluorescence in air for observing extensive air showers B. Keilhauer, M. Bohacova, M. Fraga, J. Matthews, N. Sakaki, Y. Tameda, Y. Tsunesada and A. Ulrich EPJ Web of Conferences, 53 (2013) 01010 Published online: 25 June 2013 DOI: 10.1051/epjconf/20135301010